Refreshing a paricular div containing a partial page

There are many ways you can implement this. One can be use of jQuery .load() method :

$('#targetDiv').load('/newsfeed/updates.html');

And you can include timestamp in the request to avoid caching in some browsers.

var timestamp = new Date().getTime();
$('#targetDiv').load('/newsfeed/updates.html?t='+timestamp.toString());

For more details about its usage please refer:
http://api.jquery.com/load/[^]

Hope this would help
Thanks